What is Continuous Data Protection?
Continuous Data Protection (CDP) is a backup and recovery technique that replicates and time stamps every incremental change to critical dataset. In the event of data corruption from logic errors, user mistakes or malware, one can roll back to the specific point in time before the undesired update occurred. Operations may then be resumed as if the problem never happened.
DataCore SANsymphony software-defined storage solution leverages built-in CDP functionality to record every update to a volume in a separate location and time stamp it. Unlike periodic snapshots, it is fully automated and happens continuously in real time. CDP complements your backup solution without being a replacement for it.
CDP Feature Highlights
- Protect against damage from ransomware, malware and other sources of data corruption
- Rollback to restore a volume to an arbitrary point-in-time state within a 14-day time frame
- Generate known-good restore points
- Logs and timestamps all I/Os to the selected virtual disks
- Operates independent of operating system or applications
- No need to quiesce or interrupt applications
- No host agents required
- Easy to enable protection and create rollback volumes
How Continuous Data Protection Works
CDP records every write I/O (or change), with a corresponding timestamp, that occurs against a protected volume. With continuous data protection, a rollback volume can be created representing any point-in-time just before the undesired event occurred. The rollback volume is then mapped to the original application server or a different one.
For example, consider a virus causing damage to your data at 2:41:36 PM: just return to the status at 2:41:35 PM with a rollback volume and serve it back to the original application server. As another example, consider a user deleting a file at 3:15 PM: let the administrator roll back to a point in time before it was deleted and restore the file from that copy.
Similar to snapshot requests, one can generate periodic CDP Rollback Volumes at known-good restore points by scripting a call to a PowerShell cmdlet each time an application has been quiesced and the caches have been flushed to storage.
CDP Ensures Lower RPO Than Traditional Backup and Snapshots
Because traditional backup is done on a daily basis and snapshots are taken every few hours, the recovery point objective (RPO) with these operations is much higher than CDP. Since CDP can restore the data in the affected volume to just right before the event of disruption, RPO for CDP is close to zero. Recovery time objective (RTO) values are also lower for CDP when compared to storage backup and snapshots.
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